Who is Franz Stangl from the nonfiction book, Into That Darkness: An Examination of Conscience?

Franz Stangl the main subject of the book. He is interviewed in the early 1970s when he is living as a prisoner, convicted of World War 2 war crimes. He is in his early 60s at the time. He is Austrian by birth and his transformation into a Nazi is directly connected with the rise of power of that political party in his native Austria. He claims early in the book that he chose to entrench himself in deceit for the purposes of survival and success under the Nazi regime rather than to flee the country or to endanger himself and his family further by openly opposing the Nazis.